.AddGuest {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  text-align: center;
  height: 40px;
  line-height: 40px;
}

.AddGuest a {
  display: block;
  background: blue;
  color: #fff;
  font-size: 20px;
}